Dell OptiPlex 755 User Manual page 318

1 Follow the procedures in
NOTICE:
Before touching anything inside your computer, ground yourself by touching an unpainted metal surface.
While you work, periodically touch an unpainted metal surface to dissipate any static electricity that could harm
internal components.
2 If applicable, remove the cable cover (see "Cable Cover (Optional)" on page 237).
3 Replace the computer cover:
Tilting the cover slightly, align it with the retaining strip at the back of the system.
a
Slide the computer cover backward until it snaps into place.
b
CAUTION:
Graphics card heat sinks can become very hot during normal operation. Ensure that a graphics card
heat sink has had sufficient time to cool before you touch it.
318
Replacing the Computer Cover
"Before You Begin" on page 21.
1
1 release knob